Well there's more to the client than just playing music. As GP said there is bloat but to me some features are very useful. A big part of the client is for bro

Well there's more to the client than just playing music. As GP said there is bloat but to me some features are very useful. A big part of the client is for browsing through music/album/playlists/artists. Of course you could search for music outside of Spotify but it's really convenient to have it integrated in the client. There's also a social media part (definitely bloat, I have disabled it) and more hidden features like being able to control the client from other Spotify clients (e.g. on my phone) which I use all the time. 300 MB is not great but it's low enough that I don't really care.